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@@ -200,6 +200,8 @@ Data between different tables are connected by id-columns, so called foreign key
    - surfw.online_measurements
 1. Finally the tables
    - xxx.measurements
+   
+** NOTE ** After importing or updating a row, you might be asked to select a key. Please select ** Custom Key ** and choose the id column   
 
 # Technical aspects not important for basic users 
 ## Table partitioning and use of composite primary keys